Malicious PDF — malware analysis report

Static analysis result for SHA-256 107ca84f8ad9e9b0…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 12:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0bcc21bed682f6284d77a25400b4dd SHA-1: 6342e2f7b21c788f8cdcd232d667e3a4c6c960b5 SHA-256: 107ca84f8ad9e9b08a298897c68a0000d8088fd26a537d6d653ddf0a8cca6e74
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=mhw+botanical+research+center+guide
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fg42dmu9slh841ujndtk9pmvv4/mawepugiwaluketafufuzudef.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9ecc389ad41e0860c2df90aead81592b/sezakexibot.pdf
    • https://mfdesign.hu/files/file/38398723937.pdf
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/60205423509.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/daruwizodirijikaniw.pdf
    • http://ecohost.ru/pics/images/file/69591907825.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6m643h70e1f7sqcnl24hdcgsec/fokom.pdf
    • https://majorsagilekvaros.hu/uploads/file/29375525163.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2441efb7f---soxawasalusegowetesibeb.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tcijpv0q9846i5tl44tr9o943p/bowegotuxawatefitigevar.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9d239d21---84004438125.pdf
    • http://albino-pitti.com/pub_img/file/ponuduf.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf7dd7d5---7448449221.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/53693161191.pdf
    • https://myphi.biz/nbloom/fckuploads/file/joxoxij.pdf
    • http://nktrading.qa/file/files/13653822924.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/vudeniridu.pdf
    • https://dbjadow.pl/attachments/file/49601805777.pdf
    • http://creptiles.dk/userfiles/file/malupezebapog.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160859c521c050---bujitofuse.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/bbo81vssal2md54d6rm6htatf3/54443687216.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/dbb2nlcj2afkonll8o6im5qrkv/jewazenusoxerifidozeb.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877db0dd352---74051579226.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37d9c865398ada14e995697681c9385b/72154814025.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ac.bin
bc538b347de2a829a636472d4562829890be249ae0dedc99687df41313c78612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16732 bytes
font_01_sfnt_off00011cde.bin
6ae436f8a9f7af050809fd9c086e6cc7bade5e8fb01940c0bdc6f8217d09a5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 10968 bytes
font_02_sfnt_off0001361c.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16092 bytes
font_03_sfnt_off00014b61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 16792 bytes

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